Simplifying IoT: Build an LED Controller with Blynk and ESP8266

1#define BLYNK_TEMPLATE_ID           "TMPL4auv4TEh5"
2#define BLYNK_TEMPLATE_NAME         "LEDcontrol"
3#define BLYNK_AUTH_TOKEN            "JSNDzCPaWyAyop0q1R_6Nn9oVco717HY"
4
5#include <ESP8266WiFi.h>
6#include <BlynkSimpleEsp8266.h>
7
8char ssid[] = "******";
9char pass[] = "******";
10
11const int ledPin = D2;  // Pin D2 (GPIO 4)
12
13BLYNK_WRITE(V0)  // This function is triggered when Virtual Pin V1 changes
14{
15  int value = param.asInt();  // Get the value from the Blynk app (0 or 1)
16  digitalWrite(ledPin, value);  // Set the LED pin to HIGH or LOW
17}
18
19void setup() {
20  pinMode(ledPin, OUTPUT);
21  digitalWrite(ledPin, LOW);  // Ensure LED is OFF initially
22  
23  Serial.begin(9600);
24  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
25}
26
27void loop() {
28  Blynk.run();
29}